The “terrible” 3 cent MCU – a short survey of sub $0.10 microcontrollers

Tim (cpldcpu) writes: Like many others, I was quite amazed to learn about a microcontroller sold for only 0.03 USD via the EEVblog last year. How was this possible? Many assumed this was a fire sale of an old product. Digging a bit further, it became apparent that there is an entire market segment of […]

Revisiting the DSETA board with an AT89C51ED2

An update on Jesus Echavarria’s DSETA board we covered previously: Some months ago I review the DSETA board due the obsolescence of the microcontroller. I use this board in some projects succesfully. But when I try to manufacture a batch of this boards, I found that the microcontroller (AT89C51RE2) was obsolete. So, the board needs […]

Microcontroller action potential generator

Scott Harden writes: Here I demonstrate how to use a single microcontroller pin to generate action-potential-like waveforms. The output is similar my fully analog action potential generator circuit, but the waveform here is created in an entirely different way. A microcontroller is at the core of this project and determines when to fire action potentials. […]

Intel(r) Quark(tm) micrcontroller D2000 based Environmental sensors board

Sergey Kiselev designed and built an Intel Quark D2000 micrcontroller based Environmental sensors board: This is a fairly small (51 x 51 mm) board, equipped with a low power Intel Quark D2000 microcontroller, and several sensors (accelerator, temperature, humidity, atmospheric pressure), as well as a mikroBUS compatible header and a Grove compatible connectors, that can be […]

Light intensity meter using AT89C52 microcontroller

AM Bhatt over at Engineers Garage writes: In the given project, LDR is used to measure light intensity inside the room. With a minor change in the circuit, it can be used to measure outdoor light intensity also. It uses microcontroller AT89C52 and LCD to display light intensity. It also indicates how much light inside […]

Obstacle sensing walking stick for visually impaired persons

Avinash Gupta wrote an article detailing his smart walking stick project for visually impaired persons This project is designed to guide a visually impaired person to walk and avoid bumping into obstacles. Low cost ultrasonic rangefinders along with a microcontroller is used to measure the distance to obstacles and if they are close enough provide a feedback […]

TI releases the MSP432 microcontroller

Introducing MSP432: MSP’s new low-power 32-bit ARM® Cortex®-M4F MCUs TI is announcing an expanded MSP portfolio including a new family of 32‐bit processors built on the ARM Cortex‐M4F core. The first family includes the MSP432P401x MCUs with 48MHz speed, 1MSPS 14‐bit ADC, up to 256KB flash, up to 64B RAM and low‐power operation of only […]

PICnano Breadboard, a 4-Layer Dirty PCB project

jechavarria shared his small 4-layer board based on the PIC18F2550 microcontroller project in the forum: The goal of this new design is try to have an Arduino Nano compatible module but with some new features, such have direct access to the power supply microcontroller. Via the project log forum.

ARM PRO MINI, an open source ARM M0 microcontroller board

Zapta designed this open source ARM M0 microcontroller board, that is available at Github: ARM PRO MINI is a small barebone open source ARM M0 microcontroller board that is great for quick prototyping and as a starting point for your own ARM based custom designs. It was designed and named after the venerable Arduino Pro […]

Audible frequency chirp sonar with the Stellaris Launchpad

Jason Bowling writes: Over the last year I’ve been working towards an underwater sonar system for ROVs and surface boats. In order to learn the basic signal processing required to detect the echoes, I initially got a simple sonar working in air with a desktop conferencing USB speaker/mic running on Windows. A writeup, including source, […]

Blueprintf – a bluetooth serial monitor

Bob Alexander of Galactic Studios made this bluetooth serial monitor for embedded microcontroller projects, the Blueprintf: One way of debugging microcontroller-based projects is to send messages out the UART serial port. Then, a UART-to-USB interface can feed the messages into your PC for display. But I wanted a small, portable device for viewing serial data without […]

Microcontroller based running light controller

Another project by Rajkumar Sharma over at Electronics Lab, a lights effects board using common bulbs: This project provides some lighting effect by the blinking pattern of the bulbs connected at its output. Up to 8 Bulbs can be connected in between connector CN2 to CN9 and AC power to control them should be connected […]

Introducing RFToy, an Arduino-compatible gadget for radio frequency modules

Ray Wang from RaysHobby has informed us of his latest open-source project called RFToy: it’s an Arduino-compatible microcontroller board for interfacing with radio frequency (RF) modules, such as the popular 433/315MHz transmitter/receiver, and the nRF24L01 transceiver. The RFToy has a built-in ATmega328, USB-serial converter (CH340G), 128×64 OLED display, three buttons, and a coin battery holder. Programming […]

A NPN transistor Electret condenser microphone preamp for microcontrollers

Davide Gironi writes: This is a NPN Electret Condenser Microphone Preamp board design for the use with microcontrollers ADC. In order to make an electret condenser microphone signal “readable” by a microcontroller ADC, it has to be matched the ADC specification of the microcontroller. Most of the time it means, add some gain to the […]

App note: Getting started with the MAXQ622 evaluation kit

Here’s an getting started guide from Maxim describing their MAXQ622 low-power RISC microcontroller: This application note describes how to create, build, and debug applications targeted for the MAXQ622 low-power RISC microcontroller. The article uses the IAR Embedded Workbench toolset and C compiler available from IAR Systems.